# Relationship history for MSHA mine 4201424

Current hierarchy: **Caldwell Stan L → South Decla Development Corp → South Hecla Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** United Minerals International Corp → South Hecla Mine; 1950-01-01 to 1980-05-26; source msha-controller-operator-history
- **controller_controls_mine:** United Minerals International Corp → South Hecla Mine; 1950-01-01 to 1980-05-26; source msha-controller-operator-history
- **controller_controls_operator:** United Minerals International Corp → United Minerals International Corp; 1950-01-01 to 1980-05-26; source msha-controller-operator-history
- **operator_operates_mine:** South Decla Development Corp → South Hecla Mine; 1980-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Caldwell Stan L → South Hecla Mine; 1980-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caldwell Stan L → South Decla Development Corp; 1980-05-27 to current/open; source msha-controller-operator-history